Re: Torque meter bearing?

From: Bill Gowen <wdgowen_at_gmail.com>
Date: Mon, 19 Apr 2010 11:36:46 -0400

I've got a really crude bearing on my torque meters and have never had a problem. I think the key is that you need a loose fit on the bearing. The needles on my meters vibrate while I'm winding. I take this to be a sign that the bearing isn't interfering with the reading. I also use long torque wires. I'm not sure what difference this makes but it seems to work well.

  ----- Original Message -----
  From: Tapio Linkosalo
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Monday, April 19, 2010 8:26 AM
  Subject: [Indoor_Construction] Torque meter bearing?


    


  I have two torque meters, both constructed from different diameters of
  brass tubing to house a torque wire. The larger for F1M and similar is
  built by a friend and works very nicely, but my copy for F1D is not as
  sensitive as I would wish it to be. It is somewhat difficult to make
  sure that the zero level is as it should be, and also I have concerns
  about the accuracy vs. sensitivity. Looks like a brass tubing rotating
  in another one has too much friction for the small forces we are
  measuring here. I even tried to dremel the inner tubing so that it has
  the bearing surfaces at the very ends of the tubing, but it did not help
  much.

  So any suggestions for improving the bearing? Would teflon or nylon make
  a more sensitive bearing, or should I replace the sliding bearing with a
  ball bearing?

  The other end is no problem as I use O-rings and have that fixed; do not
  need to have the meter for unwinding rubber.

  -Tapio-


  
Received on Mon Apr 19 2010 - 08:36:53 CEST